In some distro's (I don't know about SuSE right now) you have to update the kernel modules for certain apps.
Everytime I update my kernel, I have to install a new VirtualBox kernel module, and a new nVidia kernel module.
For Fedora you need these installed...
akmod-VirtualBox.x86_64 : Akmod package for VirtualBox kernel module(s)
kmod-VirtualBox.x86_64 : Metapackage which tracks in VirtualBox kernel module for newest kernel
My guess is there is something similar for SuSE. After that's done.. make sure you also install
virtualbox-guest-additions